Katy Perry, Hilary Duff & More Attend Miley's Bangerz Tour!

It was a star-studded night at Miley CyrusBangerz concert in Los Angeles on Saturday! The singer performed to a sold out crowd at the Staples Center, which included many familiar faces.

In the most talked-about moment of the night, the 21-year-old took a quick pause to lean over and give Katy Perry, who was in the front row, a smooch right on the lips! “I adore you @MileyCyrus,” the “Unconditionally” singer tweeted afterward.

Also in attendance? Hilary Duff, who showed up with a big group of friends. “@Mileycyrus so f*cking pumped to see you to night at staples..” she tweeted. “looks sold out for you mama!!! Congrats! #slay xxxxxx.” After the show, Miley took to Twitter herself to fangirl over the former Lizzie McGuire star. “wait?!?!?!?!?! I performed in front of @HilaryDuff ?!?!?! xxxcuse me while I go fan giiiiiiiiirl,” she wrote.

Khloe Kardashian was also in the audience, as was Joel Madden (“That @MileyCyrus puts on a great show,” he tweeted) and American Horror Story’sSarah Paulson. Christina Aguilera showed her support by tweeting a photo of the “Wrecking Ball” singer in red pants with her name down the leg (The Voice judge wore a similar style back in 2002). “Cheers from one dirrty girl to the next @MileyCyrus…wear em’ loud & proud, girl- yes!!” she gushed.